[103670] in North American Network Operators' Group
RE: Problems sending mail to yahoo?
daemon@ATHENA.MIT.EDU (Frank Bulk)
Thu Apr 10 15:37:14 2008
Reply-To: <frnkblk@iname.com>
From: "Frank Bulk" <frnkblk@iname.com>
To: "'Mike Lewinski'" <mike@rockynet.com>, <nanog@nanog.org>
In-Reply-To: <47FE57FE.6010601@rockynet.com>
Date: Thu, 10 Apr 2008 13:48:52 -0500
Errors-To: owner-nanog@merit.edu
Q> Does Yahoo! use "greylisting" to reject messages?
A> No.
The most commonly understood form of "greylisting" is where an
SMTP server will reject every message the first time it is
attempted, and then accept it if the sending server retries
later. The theory is that spammers won't retry messages, while
legitimate senders will.
Yahoo! does not utilize this method.
http://help.yahoo.com/l/us/yahoo/mail/postmaster/postmaster-05.html
-----Original Message-----
From: owner-nanog@merit.edu [mailto:owner-nanog@merit.edu] On Behalf Of Mike
Lewinski
Sent: Thursday, April 10, 2008 1:10 PM
To: nanog@nanog.org
Subject: Re: Problems sending mail to yahoo?
Barry Shein wrote:
> Is it just us or are there general problems with sending email to
> yahoo in the past few weeks? Our queues to them are backed up though
> they drain slowly.
I know that Yahoo does greylisting, and we often have a large queue
backup as a result of mailing lists with a lot of @yahoo.com addresses.
As long as you keep retrying I find that they do eventually get through.
Between greylisting and sender callback verification, it seems that
overall email delivery is increasing in latency and decreasing in
reliability.
